Hydraulic hoist



Oct. 28, 1952 E. J. ADAMS HYDRAULIC HoIsT Filed April 21, 195o 3 Sheets-Sheet l FaQ-. 49

irs-4 i -46 60 60 W. EPZJ 52 37 37 l 76"' 90' 89 .92 'i' l o 21 v .l 82 1533 l W .za 'A 88 K- l//o\ l AJ. l 66 f J INVENTOR.

EL f c/ Ha/1s BY E. J. ADAMS HYDRAULIC HOIST Oct. 28, 1952 3 Sheets-Sheet 2 Filed April 21. 1950 Odi. 28, 19.52 E, J, ADAMS 2,615,584

HYDRAULIC HOIST Filed April 2l, 1950` Sheets-Sheet 5 ATTORNEYS Patented Oct. 28, 1952 UNITED STATES PATENT OFFICE HYDRAULIC HOIST Eli .L Adams, Springfield, Mo.

Application AprillZI, 1950, Serial No. 157,347

4 claims. (ci. V21a-'59) This invention relates to improvements in hydraulic hoists of the type involving a boom which is fixed when in operative position and a hoisting cable system, the primary object of the invention being to provide more edi-cient and capable devices of this kind in Whichthe fixed boom and a diagonal brace therefor are foldable against the mast, so that th-e devices are in a compact form and occupy a minimum of space when not in use. n

Another important object of the invention is to provide 4devices of the character -indicated above which can be quickly and easily transferred back and forth between a mounting on a highway 4truck bed and a ground frame or dolly without the use of tools.

A further important obj ectof this invention is to provide devices of the character indicated above having an arrangement of mast, fixed boom and hydraulically operated hoist' cable system which provides a straight line lift and which maintains the same power ratio over the entire lifting range.

Other important objects and `advantageous features of the invention will be apparent from the following description and the accompanying drawings, wherein, for purposes of illustration only, specific embodiments of the inventionare set forth in detail.

In the drawings, wherein like numeralsfdesignate like parts throughout the several views: y

Figure 1 is a left-hand side elevation, showing a form of the invention involving a ground frame or dolly and a lifting arm;

' Figure 2 .is a top plan View of Figure l;

Figure 3 is an enlarged fragmentary transverse vertical section taken on the line 3-3 ofvFig-i ure 1;

Figure 4 is a fragmentary right-'hand side elevation of the mast, showing the hydraulic hand pump;

Figure 5 is an enlarged fragmentary vertical longitudinal section taken throughY the lower part of the mast and the dolly; l

Figure Gis an enlarged fragmentary'vertical longitudinal section taken through the lupper part of the mast. and the boom;

Figure 7 is an enlarged perspective view of the mast pulley yoke;

Figure 8 is an enlarged horizontal section taken on the line 8-8 of Figure 5;

Figure 9 is a fragmentaryv side elevation,show ing a formvof the invention involving a truck frame or bed mounting, the lifting arm being absent, and the boom and the brace being in folded inoperative positions;

f Figure 10` is an enlarged fragmentary 'vertical longitudinal Lsection taken on the'line Ill- HI o-f Figure 9; 'f Figure 11 is a top perspective view of the truck mounting tube or'socket;

VFigure 12 is an enlarged fragmentary horizontal sectionv tak-en on the line I2-I 2 of Figure 1;

Figure 13 is a fragmentary vertical longitudinal section taken on the line I3-I3 of Figurelz. f Referring in detail particularly to Figures 1 to 8 of the drawings, the ground frame or dolly, generally designated` I5, is Aeshaped in plan and comprises the two forwardly diverging horizontal I-'beam legs I6, I6. welded or otherwise suitably secured to the under side of a heavy horizontal base plate I'I of triangular shape and having ground-engaging wheels I8, I8 on their forward ends. The apex portion of the base plate has beneath it a steerable caste-r wheel devicenvolving aninverted U-s'haped body I9 having a vertica1 spindle 20 journaled thro-ugh the plate and in a tubular journal 2| rising from the plate. A reclining U-shaped yoke 22 has the forward ends of its arms pivoted at 23 to the lower ends of the arms of the body I9 and has a vertical bar 2.4 rising from the rearward end surmounted by a transverse handle 25. A ground-engaging wheel l2li vhas an Iaxle 21 journaled in the arms of the reclining yoke 22 at a point intermediate the-pivots 23 and the rearward end of the yoke 22, whereby upon rearward swinging of the bar 24, l.the wheel 26 is forcibly depressed in engagement with the ground 28, as shown in Figure 5, so as to elevate the fixed feet 29 depending from'the rear ends of the I-beam legs IB out of engagement with the ground, whenever it is desired to move thefdevice over the ground rollably supported on the wheels I8 and 2B.

The dolly I5 further comprises the socket tube 3l) welded 'or otherwise suitably fixed to rise from afcentral part of the base plate I'I and having on its Vupper endl an'external thrust flange 3I. A

pairof front diagonal brace plates 33 vand asingle rear brace`plate34 are'secured'to, extend between the plate vI'I and the socket tube 30. Y The hoistingassembly, which is generally designated 35, comprises the perpendicular .mast 36 comprising a pair-of vvertically elongated parallelly spaced, similar plates 31 to and between whose lower ends is welded -a heavy outer tube 38 which dependsbelow the lower ends of the plates 3l and isof an external diameter to fit rotatably in the socket tube 30 and serv-e as the spindle for the hoisting assembly. Also welded to the lower ends of the'mast .plates 3l and lto the spindle tube 38 ry is an 'external flange 39 which rotatably rests 3 upon the thrust flange 3l on the upper end of the socket 30.

As shown in Figure of the drawings, the spindle tube 38 has a closed lower end 40 to bear upon a portion of the plate l1 exposed by the socket tube 3U and surrounding an access hole 4I provided in the plate l1. Within the spindle tube 38 is seated the hydraulic cylinder` 42 with its lower end engaging the closed lower end 40 of `the spindle tube and having a breather plug 43 traversing the closed end 48 and accessible through the hole 4|. The upper end 44 of the hydraulic cylinder 42 rises above the spindle-tube 38 and between the mast plates 31, and a piston rod 45 rises through the upper end 44 and has fixed thereon, as indicated at 46, a U-.shaped pulley yoke 41 having the pulley wheel 48 journaled between its arms in vertical alignment with the piston rod 45.

. Extending through and between the upper ends of the mast plates 31 in vertical alignment with the pulley wheel 48 is the upper bolt 49 which serves as the pivot for the boom 50, as the axle for the upper mast pulley 5l, and as the upper support for the pulley yoke 52. A similar lower axle bolt 53 which carries the lower pulley 54 is offset forwardly from the upper axle bolt to provide clearance behind it for hoisting cable 55.

The mast pulley yoke 52, as shown in Figures 6 and 7, comprises an inverted U-shaped form having spaced depending legs 56 formed with pairs of upper and lower holes 51 and 56, respectively, to pass the upper and lower axle bolts 49 and 53, respectively. The legs 56 are spaced to confine the upper and lower pulleys 5I and 54 to a centered position between the mast plates 31, and to provide spaces between the legs '56 and the inner surfaces of the mast plates 31 for the rearward ends of the side plates 59 of the boom 50.

- The boom 50 comprises the elongated side plates 59 having the downwardly offset portions 60 journaled on the upper axle bolt 49 between the yoke legs 56 and the mast plates 3l'. A web 6l is connected to and between the lower edges of forward portions of the boom side plates 59 to form a rigid structure. Depending ears 62 on the forward ends of the side plates 59 carry between them the boom pulley 63. A depending longitudinal reinforcement 6l on the web 6l has pivoted thereto at 64 the bifurcated upper end of the boom brace 65.

The boom brace 65 comprises spaced side bars 66 suitably connected together for rigidity and terminating at their lower ends, as shown in Figures 12 and 13 in a tubular cylindrical crossinember 61 which spans the Width of the space between the mast side plates 31 and can turn and slide vertically between confining frcnt'and rear vertical guide strips 68 and 69, respectively, formed on the inward surfaces of the mast side plates 31 near their forward edges 10. In the region of the guide strips the mast side plates 31"' have vertically spaced upper and lower holes 1| and 12, respectively, arranged to pass a removable pin 13 which is arranged to pass Athrough the tubular cylindrical cross-member 61 on the lower end of the boom brace 65. With the pin 13 securing the lower end of the boom brace relative to the lower holes 12, the boom 59 is in a horizontal position at right angles to the mast. When higher lift is desired, the lower end of the boom brace is connected to the mast with the pin 13 in the upper holes 1l and the boom 56 then extends forwardly at an upward angle Vlabove its usual horizontal position. Upon disengagement of the pin 13 from the mast, the boom 50 and the boom brace 65 are freed to fall to the inoperative storage position shown in Figure 9, wherein the boom brace 65 is nested between the mast plates 31 and the boom 50 depends along the forward side of the boom brace 65.

Bolts 14, acting to space and connect the mast plates 31, traverse these plates atlverti'cal intervals in vertically aligned rowsv spaced from the forward and rearward edges of the plates. On the flange 39 on the lower end of the mast 36 is a cam lever operated locking pin device 15 which has a pin 16 arranged to be engaged in one or more holes 11 provided in the socket thrust flange 3| to lock the mast against turning in the socket 30 from a selected position.

A suitable hydraulic pump device, generally designated 19, is mounted on the outside of the right-hand mast plate 31 and has a conduit 19' connected in a suitable manner (not shown), to the hydraulic cylinder 42. An operating handle is provided on the device 19 as well as a let-01T valve lever 8l.

The hoisting cable 55 terminates at its forward end in a hook 82 to be engaged with the load to be hoisted or with an element to be pulled or stretched. The cable 55 is trained upwardly and rearwardly over the boom pulley 63 and rearwardly and downwardly over ,the upper mast pulley 5l, then forwardly under the hydraulic piston pulley and upwardly to the lowermost pulley 54. The cable is trained rearwardly over the lower mast pulley 54 and then brought downwardly between the pulley 54 and the rear iiight of the cable and anchored at `82' to the yoke 41.

It will be apparent from the foregoing that upon operation of the hydraulic pump handle 86 with the valve lever 8| properly set, the piston rod 45, and hence the pulley 48, will be moved downwardly, thereby in effect shortening the cable I55 and moving the hook 82 upwardly in a hoisting action. Resetting the valve lever 8l to open the Valve and pulling down on the hook 82 restores the piston rod pulley 48 to elevated starting position, thereby letting the cable hook B2 subside to engage a load.

For lifting low lying objects, the dolly I5 has a lift arm 85 positioned between the legs I6 and pivoted at its rearward end at 86 between depending ears 81 on the forward part of the base plate l1, as shown in Figures 1 and 5. The arm 85 consists of spaced and connected side bars 88 having a rigid bar extension 89 on its forward end including a disc to engage under the load. The arm 85 has an upwardly projecting longitudinal reinforcement 9| intermediate its ends having a hole 92 with which the cable hook 82 is to be engaged. The device is then operated in the usual way to elevate and depress the lifting arm 65. i Referring now to Figures 9 to l1 of the drawings', showing the highway truckrnounted form of the invention, it will be understood that the hoisting assembly35 of this form is identical with that described above, but a different mounting is involved.

In Figures 9 to 1l, the mounting takes the form of a socket 3D0. having a closed bottom 46a and having a relatively wide thrust fiange 31a on its upper-end. The socket 30a is passed downwardly through an opening (not shown) provided in the bed or platform 93 of the truck 94, preferably at a forward vcorner thereof near one side edge with the flange 31a resting upon the platform and bolted or otherwise secured-in place, as indicated at 95. The part of the socket a depending below the platform 93 is anchored relative to a truck chassis frame side member 96 by braces 9? terminating in an abutment plate 98 having a clamp 99 embracing the socket 39a, as shown in Figures 9 and 10.

The flange Sla of the socket 30a is provided with a plurality of holes H for selective engagement by the locking pin 76 of the locking device '15, whereby the hoisting assembly 35 can be locked with the boom 59 pointing in any direction.

Whenever it is desired to use the hoisting assembly on the truck 9d, instead of on the dolly I5, the hoisting assembly 35 is simply lifted out of the dolly socket 30, and the spindle 38 inserted in the socket 30a of the truck mounting.

I claim:

l. In a hoist, a support, a perpendicular mast having a lower end seated on said support, a boom having a rearward end pivoted on the upper end of said mast, a diagonal rearwardly declining boom brace having a forward end pivoted to a point intermediate the ends of said boom, said boom brace having a rearward end slidably connected for vertical movement along said mast, means acting between the rearward end of said boom brace and said mast for anchoring the rearward end of said boom brace to said mast whereby said boom is fixed to extend horizontally, a boom pulley on the forward end of said boom, mast pulley means on the upper end of said mast, a vertically movable member having a pulley on its upper end, said vertically movable member being located along the lower part of said mast and in line with said mast pulley means, a cable having a hook on its forward end, said cable depending from and being trained rearwardly over said boom pulley and over said mast pulley means, then downwardly and anchored to said vertically movable member, and operating means for elevating and depressing said vertically movable member to raise and lower said hook.

2. In a folding hoist, avertical mast comprising a pair of vertically elongated plates, means securing said plates together in laterally spaced relation to each other, a bolt on the upper ends of said plates and extending between said plates, a boom having a rear end pivoted on said bolt between said plates, whereby said boom can be folded downwardly from a horizontal operative position to a folded depending position along the forward side of said mast, said mast plates having vertical guide means extending therealong, a diagonal brace having a forward end pivoted to said boom at a point intermediate the ends of said boom, a crosshead on the rearward end of said brace having ends slidably confined in said guide means whereby the movements of said boom and of said brace between folded and operative positions are guided, and means engageable with said brace crosshead and said mast plates for locking said crosshead in a vertical position along said mast plates wherein said boom is held in a horizontal position.

3. In a folding hoist, a vertical mast comprising a pair of vertically elongated plates, means securing said plates together in laterally spaced relation to each other, a bolt on the upper ends of said plates and extending between said plates, a

boom having a rear end pivoted on said bolt between said plates, whereby said boom can be folded downwardly from a horizontal operative position to a folded depending position along the forward side of said mast, said mast pla-tes having vertical guidel means extending therealong, a diagonal brace having a forward endpivoted to said boom at a point intermediate the ends of said boom, a crosshead'on the rearward end of said brace having ends slidably confined in said guide means whereby the movements of said boom and of said brace between folded and operative positions are guided, and means engageable wit said brace crosshead and said mast plates for locking said crosshead in a vertical position along said mast plates wherein said boom is held in a horizontal position, said brace being narrowerl than the space between said mast plates whereby said brace can occupy a position between said mast plates in the folded position of said brace.

4. In a folding hoist, a vertical mast comprising a pair of vertically elongated plates, means securing said plates together in laterally spaced relation to each other, a bolt on the upper ends of said plates and extending between said plates, a boom having a rear end pivoted on said bolt between said plates, whereby said boom canr be folded downwardly from a horizontal operative position to a folded depending position along the forward side of said mast, said mast plates having vertical guide means extending therealong, a diagonal brace having a forward end pivoted to said boom at a point intermediate the ends of said boom, a crosshead on the rearward end of said brace having ends slidably confined in said guide means whereby the movements of said boom and of said brace between folded and operative positions are guided, and means engageable with said brace crosshead and said mast plates for locking said crosshead in a vertical position along said mast plates wherein said boom is held in a horizontal position, said brace being narrower than the space between said mast plates whereby said brace can occupy a position between said mast plates in the folded position of said brace, hoisting cable means associated with said boom, and hydraulic operating means mounted between said mast plates and connected to said hoisting cable means.

ELI J. ADAMS.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name i Date 124,878 Blood Mar. 26, 1872 536,399 Sawers Mar. 26, 1895 655,321 Anderson Aug. 7, 1900 788,789 Ord May 2, 1905 1,570,787 Schroeder Jan. 26, 1926 1,974,463 Kintzley Sept. 25, 1934 2,131,133 Babson Sept. 27, 1938 2,374,045 Soucia Apr. 17, 1945 2,400,803 Barnhart May 21, 1946 2,476,192 Hall July 12, 1949 2,503,590 Ormsby Apr. 11, 1950 2,517,813 Wallace Aug. 8, 1950 

